The aspens on Kebler had turned the week before and were already past, which Mara had not expected. She had driven up from Fort Collins on Sunday and the gold she'd been promising herself was scattered brown across the road, six days early or two weeks, depending which baseline you wanted. The drive had given her time to think about the list. By the time she pulled into Crested Butte the list had rearranged itself three times in her head and she'd lost confidence in the version she'd sent to Iris on Friday.
RMBL365's upstairs room smelled like coffee and the particular dust that came off the building's old wood when the heat first turned on in fall. Iris had the window cracked anyway. Mara took the chair by the radiator because her hip had stiffened on the drive and Iris, who had known her since 2023 and remembered things like that, had left it open for her without saying anything.
"Sierra's on in two minutes," Iris said. "Devon's bringing the tablet."
"How's the connection up there today?"
"Better than yours will be on the way home."
Devon came in with the tablet and a paper printout that he set down between them like a peace offering. The printout was the inventory — every instrument across the East River, color-coded by physical condition, by replacement cost, by what the model thought it contributed to coupled questions in the last three years. The model's column was new this year. Mara had argued against including it at first and then changed her mind in August when it flagged the upper Avery piezometer cluster as carrying more weight in the synthesis questions than anyone on the team had assigned it. She still didn't fully trust the column. She used it anyway.
Karen, the administrative director, came in last with her laptop open. "Sierra's calling."
The peer from the Sierra observatory came up on the screen — Tomás, a hydrologist Mara had known since a 2029 AGU session — with the gray light of a Bishop morning behind him. He waved. "You all look warm."
"It snowed Sunday night," Devon said. "Six inches at Gothic. Gone by Monday afternoon."
"We're still in fire watch down here."
"In October," Iris said, not quite a question.
"In October."
They got to it. Karen had the spreadsheet on the larger screen and walked them through the reserves position first, which was where Mara had asked her to start. The number was lower than Mara had braced for. The 2034 contraction had cost more than the model predicted because the operating costs of the radar suite had risen faster than the operating costs of anything else, and the 2036 shock had come before the buffer recovered. They had enough for one of two things: a full replacement of the upper basin atmospheric package, or a full replacement of the lower groundwater array. Not both. Possibly partial on each, with the gaps filled by partnership or by acceptance.
"Walk me through which piezometers are actually at end of life," Tomás said. "Not the sticker date. The physical state."
Devon pulled up the diagnostic summary. The instruments self-reported now; had since the 2032 refit. The summary read like a medical chart — drift trends, recovery latency, the number of times the sensor had auto-flagged in the last quarter. Devon had taught Mara to read it like a nurse reads vitals. You looked for the patterns the instrument itself didn't yet know to call.
"Avery 3 is gone," Devon said. "It's calling clean data but the recovery curve is wrong. I'd retire it before the spring melt and run the cluster on Avery 1 and 2 until we decide."
"And Avery 1 and 2 are?"
"Tired. Two, three more seasons. Maybe four."
Mara reached for the printout. "What about Copper?"
"Copper's fine for now."
She found the row anyway. Copper Lake piezometer, installed 2024, refit 2032, currently reading. The talus slope above Copper was where she had taken her first graduate student in 2025 and where, last July, she had stopped to catch her breath on the way up and noticed bumble bees on a stand of Ipomopsis aggregata growing at an elevation where in 2023 she would not have looked for Ipomopsis at all. The instrument and the flower and her own slower lungs were all parts of the same record now. This was what they had spent the campaign to make possible. It did not feel like triumph. It felt like a thing she was responsible for, the way you were responsible for an aging parent.
"Tomás," she said. "What's your interest, concretely."
He nodded; he had been waiting for this. "We have two atmospheric profilers we're decommissioning next year. They're not new. They're calibrated and they have three to five seasons in them depending on how you treat them. We can't keep running them. We're trying to figure out whether to mothball them or place them somewhere that can use them. If you took them, we'd want shared data access through 2042 and co-authorship on synthesis work that draws on them. We're not trying to sell you something. We're trying to keep them running."
Iris was already nodding. Mara watched her. Iris had been the one to say, in the August call, that she would not accept a partnership that compromised the coupling. The integration was the point. A profiler from somewhere else that didn't talk cleanly to the rest of the stack was a piece of equipment, not part of the observatory.
"Which models," Iris said.
Tomás named them. Devon's face did a small thing — a relaxation Mara caught because she'd been watching for it. They would talk to the stack. They had talked to the stack before; Devon had run a pilot in 2035.
"That gets us the upper atmospheric coverage," Iris said slowly. "If they hold. If they don't, we're worse off than retiring our own and replacing nothing."
"They'll hold," Tomás said. "I won't promise four years. I'll promise two."
Karen was already running numbers. "Two years of operating support against the capital we save lets us do most of the groundwater replacement. Not Avery 3. The cluster."
"Avery 3 is going to retire whether we replace it or not," Devon said.
"Then we retire it."
There was a pause. Mara realized she had been holding the printout hard enough that the edge had crumpled. She set it down.
"I want to caveat something," she said. "I don't want us to decide today that Avery 3 stays retired permanently. I want us to decide today that we retire it for the 2039 season and revisit in 2040 with the integrated record showing us what we lost."
"Agreed," Iris said.
"Agreed," Devon said.
Karen typed. "Recorded as conditional."
Tomás was smiling on the screen, the small smile of someone who had come into a meeting expecting to leave with less. "I'll send the transfer paperwork this week. We'll need to coordinate the move before the passes close."
"They've been closing later," Devon said.
"They've been closing weirder," Iris said. "Last year was November 18. Year before was October 9."
They worked through another forty minutes — the calibration schedule, who would drive down to Bishop to inspect the profilers, whether Devon's team had the bandwidth to absorb two new instruments before spring melt or whether they needed to push the integration to summer. Mara watched Iris run the meeting and thought about the fact that Iris had been a postdoc when Mara first met her and was now the person Mara called when she needed to know whether a decision was real or aspirational. The transition had happened without ceremony, the way most things at RMBL happened.
At eleven they broke. Karen had another meeting. Tomás signed off. Mara stood, slowly, and Iris noticed and pretended not to.
"Lunch?" Iris said.
"Yes. Then I want to walk up to the meadow before I drive back. The light's been strange this week and I want to see what it looks like at the upper plots."
"It's cold up there."
"I have the jacket."
"You always say you have the jacket."
"I have the jacket this time."
Iris laughed. Devon was already at the door, tablet under his arm, half out into the hallway and the rest of his afternoon. He stopped.
"I'm going to draft the Avery memo tonight," he said. "I'll send it before I leave. You'll hate the first version."
"I'll hate the first three versions."
"I know."
He went. Mara picked up the printout — the crumpled corner, the model's column she still did not fully trust — and folded it into her bag. She had a sentence she wanted to write before she forgot it. She would write it in the car if she had to. She would argue with it for a week.